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Doug's Headers D313-SS 64-77 BBC 1 3/4" 304 SS Long Tube Headers

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#447D313SS

Doug's Headers D313-SS 64-77 BBC 1 3/4" 304 SS Long Tube Headers

Natural stainless-steel finish offers superior resistance to rust and corrosion
3/8" thick 304 stainless machine flanges to prevent warping
CNC 304 stainless mandrel bent tubes for an accurate fit and improved flow

Type:

Stainless Steel

$987.30

/each

Factory Shipped

$1,097.00

Save $109.70

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Product Summary

Long Tube Header Tube Type, Round Exhaust Port Shape

Natural stainless-steel finish offers superior resistance to rust and corrosion
3/8" thick 304 stainless machine flanges to prevent warping
CNC 304 stainless mandrel bent tubes for an accurate fit and improved flow
Precision formed long transition collectors and long tube design reduce backpressure and increase higher RPM horsepower

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Key Specs

MFG. Part #	D313-SS
Header Tube Type	Long Tube
Exhaust Port Shape	Round
Flange Style	Standard
Primary Tube Diameter	1-3/4"

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Need To Know

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855.313.9176

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Doug's Headers D313-SS Details

Doug's Headers D313-SS long tube headers provide the greatest increases in horsepower and torque across the entire RPM spectrum. The choice of racers worldwide, Doug's long tube headers are designed for the car owner who wants maximum power and the highest quality header on the market. This fitment is tailored for popular aftermarket engine swap kits. Doug's engine swap headers were developed to solve common fitment issues in tight spaces, making your swap process smoother. No more guesswork or modifications needed - just straightforward installations that save you time and frustration.

For the enthusiast who demands the best, Doug's Headers are not just components; they're a statement of excellence, a commitment to leading-edge performance, and a nod to the glory days of muscle cars and drag racing. Join the ranks of champions. Experience the unmatched quality and performance of Doug's Headers today.

Natural stainless-steel finish offers superior resistance to rust and corrosion
3/8" thick 304 stainless machine flanges to prevent warping
CNC 304 stainless mandrel bent tubes for an accurate fit and improved flow
Precision formed long transition collectors and long tube design reduce backpressure and increase higher RPM horsepower

Application

Designed to fit 396-502 GM A & F Body, Chevy Big Block Applications.

Specs

Finish: 304 Stainless Steel
Material: 304 Stainless Steel
Design: Full-length
Primary Tubing Diameter: 1.75 Inches
Collector Port Diameter: 3.0 Inches
Port Shape: Round
Tube Wall Thickness: 16 Gauge
Flange Thickness: 0.375 Inches
Collector Attachment: 3-Bolt Flange
Oxygen Sensor Port: No
Gasket Or Seal Included: Yes
Mounting Hardware Included: Yes
Grade Type: Performance
Color: Silver
Sheen Level: Satin

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Aeromotive & PerTronix Black Friday 10% Off Sale

Black Friday Savings Are Here! From November 1 2026 through November 30 2026, save 10% on all Aeromotive and PerTronix products, including top performance brands like Doug's Headers, Taylor Cable, and JBA Performance Exhaust. Whether you're upgrading your fuel system, ignition components, headers, spark plug wires, or exhaust setup, this limited-time offer makes it easy to get premium performance parts at a great price. No coupon required, just shop qualifying Aeromotive and PerTronix brands and enjoy instant savings all month long.

Guides & Documents

Headers Installation Instructions (447D313SS)

CARB Warning

For race/ off road use or for use on pre-1966 vehicles.

Emissions warning: this part only legal for sale or use in California for racing (competition) vehicles which may never be used, registered, or licensed for use upon a public highway, or if installed in vehicles model-year 1965 or older; motorcycles model-year 1977 or older; or off-highway recreational vehicles (such as off-road motorcycles and all-terrain vehicles) model-year 1996 and older. Any other use renders the vehicle tampered and not legal for use on California public highways (any public street or roadway, public dirt road, public park, or publicly maintained right of way open to the use of the public for vehicular travel). Violations subject to $37,500 penalty per violation per vehicle, revocation of registration, loss of use on California public right of ways, and proof of correction for tampering. There are similar restrictions and penalties under federal law and the laws of all other states with penalties under federal law of up to approximately $45,268 per tampered vehicle and/or engine.

CA WARNING:

Can expose you to lead, a carcinogen and reproductive toxicant. See www.P65Warnings.ca.gov

CARB warning

Doug's Headers D313-SS Specifications

KEY SPECS
MFG. Part #	D313-SS
Brand	Doug's Headers
Header Tube Type	Long Tube
Exhaust Port Shape	Round
Flange Style	Standard
Primary Tube Diameter	1-3/4"
Material Type	304 Stainless Steel
Color	Natural
Weld-Up	No
Finish	Stainless
Hardware Included	Yes
Gasket(s) Included	Yes
Collector Reducers Included	Yes
Collector Reducer Exit Diameter	2.5"

GENERAL
Sold in Quantity	Each
GTIN Code	694342557065

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